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Business Segment Information (Schedule Of Operating Income Derived From Revenues And Expenses By Segment) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Revenues $ 1,706.3 $ 1,966.0  
Consolidated Operating Income (Loss) 583.4 531.0  
Total Assets 29,338.1   $ 31,077.2
Eliminations      
Segment Reporting Information [Line Items]      
Revenues (143.4) (120.0)  
Corporate and Other      
Segment Reporting Information [Line Items]      
Revenues 140.1 116.9  
Consolidated Operating Income (Loss) 5.0 2.2  
Total Assets 1,327.3   3,450.1
Corporate and Other | Unaffiliated      
Segment Reporting Information [Line Items]      
Revenues 0.2 0.2  
Corporate and Other | Intersegment      
Segment Reporting Information [Line Items]      
Revenues 139.9 116.7  
Columbia Operations      
Segment Reporting Information [Line Items]      
Revenues 956.9 1,051.9  
Consolidated Operating Income (Loss) 362.0 351.8  
Total Assets 13,789.8   13,664.5
Columbia Operations | Unaffiliated      
Segment Reporting Information [Line Items]      
Revenues 953.7 1,048.9  
Columbia Operations | Intersegment      
Segment Reporting Information [Line Items]      
Revenues 3.2 3.0  
NIPSCO Operations      
Segment Reporting Information [Line Items]      
Revenues 752.7 917.2  
NIPSCO Operations | Unaffiliated      
Segment Reporting Information [Line Items]      
Revenues 752.4 916.9  
Consolidated Operating Income (Loss) 216.4 177.0  
Total Assets 14,221.0   $ 13,962.6
NIPSCO Operations | Intersegment      
Segment Reporting Information [Line Items]      
Revenues $ 0.3 $ 0.3